prevent binding of a signal tht crossed the synaptic gap (binding of neurotransmitter molecules to their specific receptors on the postsynaptic membrane opens ion channels which completes the transmission poison tht blocked the acetylcholine receptors would prevent reception of the signal)

type of neurotransmitter??

dopamine => biogenic amines

GABA => amino acids

NO (nitric oxide) => gas

complex fire/don't fire decision making by neurons is most directly a result..?

combination of signals from excitatory & inhibitory synapses

(ea. neuron is on the receiving end of thousands of synapses, some excitatory & some inhibitory. At any instant, the 'decision' whether to initiate an action potential is based on the combined effect of ion currents induced by both kinds of synapses)